LG MC-807WR Service Manual
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LG MC-807WR Service Manual

LG MC-807WR Service Manual

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MICROWAVE OVEN
SERVICE MANUAL
MODEL: MC-807WR
CAUTION
BEFORE SERVICING THE UNIT,READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
January, 2005
P/NO : 3828W5S4528
Printed in Korea

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  • Page 1 Website http://biz.lgservice.com MICROWAVE OVEN SERVICE MANUAL MODEL: MC-807WR CAUTION BEFORE SERVICING THE UNIT,READ THE SAFETY PRECAUTIONS IN THIS MANUAL. January, 2005 P/NO : 3828W5S4528 Printed in Korea...

  • Page 2: Safety Precautions

    SAFETY PRECAUTIONS This device is to be serviced only by properly qualified service personnel. Consult the service manual for proper service procedures to assure continued safety operation and for precautions to be taken to avoid possible exposure to excessive microwave energy. PRECAUTIONS TO BE OBSERVED BEFORE AND DURING SERVICING TO AVOID POSSIBLE EXPOSURE TO EXCESSIVE MICROWAVE ENERGY...

  • Page 3: Table Of Contents

    CONTENTS (Page) SAFETY PRECAUTIONS - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Inside front cover SPECIFICATIONS - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 1-1 CAUTIONS - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 2-1 INSTALLATIONS - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 3-1...

  • Page 4: Specifications

    SPECIFICATIONS ITEM DESCRIPTION MODEL MC-807WR 230 Volts AC 50 Hz Power Requirement Single phase, 3 wire grounded Microwave 1350W Grill 1250W Combination 2650W Convection 1350W (Max. 2550W) Power Output 900 Watts full microwave power (IEC60705) Microwave Frequency 2450 MHz Magnetron...

  • Page 5: Cautions

    CAUTIONS Unlike other appliances, the microwave oven is MICROWAVE RADIATION high-voltage and high-current equipment. Personnel should not be exposed to the Though it is free from danger in ordinary use, microwave energy which may radiate from the extreme care should be taken during repair. magnetron or other microwave generating device if it is improperly used or connection.

  • Page 6: Installations

    INSTALLATIONS BEFORE YOU BEGIN, READ THE FOLLOWING INSTRUCTIONS COMPLETELY AND CAREFULLY. INSTALLING EARTHING INSTRUCTIONS 1. Empty the microwave oven and clean inside it with This microwave oven is designed to be used in a fully a soft, damp cloth. Check for damage such as earthed condition.

  • Page 7: Operating Instructions

    OPERATING INSTRUCTIONS FEATURES Oven Front Plate Window Door Screen Door Seal Control Panel MC-807WR Only ROTISSERIE-BAR Safety Door Lock System Turntable Rotating Ring ROTISSERIE-HANDLE High Rack Low Rack Metal Tray CONTROL PANEL 1. KNOB: Used to select the cooking mode.

  • Page 8: Operating Sequence

    OPERATING SEQUENCE The following is a description of component functions 5. COMBINATION COOKING during oven operation. To Grill Combi 1. SETTING THE CLOCK Function Desired Stop/Clear Start Combi-1 cooking time Desired Stop/Clear Clock hour To Convection Combi Desired convection Stop/ Function Desired Start...

  • Page 9: Schematic Diagram

    SCHEMATIC DIAGRAM...

  • Page 10: Circuit Description

    CIRCUIT DESCRIPTION GENERAL DETAILS WHEN THE DOOR IS OPENED DURING COOKING • The low voltage transformer supplies the necessary voltage to the micom controller when power cord is • Both the primary switch and relay 2 are cut off primary plugged in.

  • Page 11: Service Information

    SERVICE INFORMATION TOOLS AND MEASURING INSTRUMENTS NECESSARY TOOLS NECESSARY MEASURING INSTRUMENTS Tools normally used for TV servicing are sufficient. • TESTER(VOLTS-DC, AC, Ohmmeter) Standard tools are listed below. • Microwave survey meter • Diagonal pliers - Holaday HI-1500 • Long nose pliers HI-1501 •...
  • Page 12 MEASUREMENT WITH OUTER CASE NOTES WHEN MEASURING REMOVED • Do not exceed meter full scale deflection. • The test probe must be removed no faster than • When you replace the magnetron, measure for 1 inch/sec (2.5 cm/sec) along the shaded area, microwave energy leakage before the outer case is otherwise a false reading may result.

  • Page 13: Measurement Of Microwave Power Output

    MEASUREMENT OF MICROWAVE POWER OUTPUT • Microwave power output measurement is made with • The microwave power output P in watts is calculated from the following formula : the microwave oven supplied at its rated voltage and operated at its maximum microwave power setting 4187 X (∆T) + 0.88 X (T ) X M with a load of (1000 ±...
  • Page 14 D. DOOR GROSS ASSEMBLY REMOVAL F. AIR DUCT ASSEMBLY REMOVAL 1) Disconnect the leadwire from lamp and MGT 1) Open the door. thermostat. 2) Remove the choke cover very carefully with a flat- 2) Remove the mounting screw to the magnetron. blade screwdriver.
  • Page 15 H. FAN MOTOR ASSEMBLY REMOVAL J. THE TURNTABLE MOTOR REMOVAL 1) Remove the turntable. 1) Discharge the high voltage capacitor. 2) Remove the turntable shaft VERY CAREFULLY 2) Disconnect the leadwire from fan motor, noise filter with a slotted screwdriver. and high voltage capacitor.
  • Page 16 K. C-MOTOR, THERMISTOR AND SHEATH HEATER REMOVAL 1) Remove the two screws securing the cover assembly to the oven cavity. 2) Disconnect the leadwire from the circulation motor terminal and the sheath heater. 3) Remove the screws of the thermistor, guide assy- chamber and lift up the guide assy-chamber.

  • Page 17: Interlock Continuity Test

    INTERLOCK CONTINUITY TEST WARNING : FOR CONTINUED PROTECTION AGAINST EXCESSIVE RADIATION EMISSION, REPLACE ONLY WITH IDENTICAL REPLACEMENT PARTS. TYPE NO. SZM-V 16-FA-63 OR VP-533A-OF FOR PRIMARY SWITCH TYPE NO. SZM-V 16-FA-62 OR VP-532A-OF FOR MONITOR SWITCH TYPE NO. SZM-V 16-FA-63 OR VP-533A-OF FOR SECONDARY SWITCH B.

  • Page 18: Component Test Procedure

    COMPONENT TEST PROCEDURE CAUTIONS 1. DISCONNECT THE POWER SUPPLY CORD FROM THE OUTLET WHENEVER REMOVING THE OUTER CASE FROM THE UNIT. PROCEED WITH THE TEST ONLY AFTER DISCHARGING THE HIGH VOLTAGE CAPACITOR AND REMOVING THE WIRE LEADS FROM THE PRIMARY WINDING OF THE HIGH VOLTAGE TRANSFORMER.
  • Page 19 COMPONENTS TEST PROCEDURE RESULTS Antenna Gasket Chassis Filament NOTE: When testing the magnetron, be sure to install the magnetron gasket in the correct position and be sure that the gasket is in good condition. HIGH VOLTAGE Measure the resistance. Normal: Momentarily indicates CAPACITOR (Ohm-meter scale: Rx1000) several ohms, and then...
  • Page 20 COMPONENTS TEST PROCEDURE RESULTS FUSE Check for continuity of the fuse with an Normal Abnormal multi-meter. NOTE: If the fuse is blown, check the primary, the secondary, and the monitor switches, H.V.D. and H.V.C. before replacing the fuse. If the fuse is blown by improper switch operation replace the defective switch and the fuse at the same time.
  • Page 21 COMPONENTS TEST PROCEDURE RESULTS Cooking Start Disconnect the 8 pin Check for P.C.B. connector. connector from P.C.B. (Refer to schemetic diagram) RELAY 2, RELAY 3 Cooking Start Relay 3 OF P.C.B. (Wire leads removed.) Note: Relay Relay 1 Relay 1: Fan motor Turntable motor Oven lamp Relay 2: Microwave...
  • Page 22 COMPONENTS TEST PROCEDURE RESULTS Normal : COM-230V : Approx. 150 Ω CIRCULATION MOTOR (Wire leads removed) Abnormal : Infinite or several ohm. 230V(BL) NOTE: (YL) ) = WIRE COLOR Cooking Start RELAY 4, 6 OF P.C.B (Disconnect the 9 pin connector from P.C.B) See Schematic Dagram on page 4-3)

  • Page 23: Trouble Shooting

    TROUBLE SHOOTING WHEN YOU GET A COMPLAINT FROM YOUR CUSTOMER, EVALUATE THE COMPLAINT CAREFULLY. IF THE FOLLOWING SYMPTOMS APPLY, PLEASE INSTRUCT THE CUSTOMER IN THE PROPER USE OF THE MICROWAVE OVEN. THIS CAN ELIMINATE AN UNNECESSARY SERVICE CALL. CAUTIONS 1. Check grounding before checking for trouble. 2.
  • Page 24 (TROUBLE 1) The following visual conditions indicate a probable defective control circuit. 1. Incomplete segments. • Segment missing. • Partial segment missing. • Digit flickering (NOTE: Slight flickering is normal.) 2. Colon does not turn on or blink. 3. A distinct change in the brightness of one or more numbers in display. 4.
  • Page 25 (TROUBLE 2) Oven does not operate at all ; Display window does not display any figures and no input is accepted. CONDITION CHECK RESULT CAUSE REMEDY Replace primary Malfunction of the Check continuity 1. Fuse blows. Continuity. and monitor monitor switch. of monitor switches.
  • Page 26 (TROUBLE 3) Display shows all figures set, but oven does not start cooking while desired program times are set and START pad is touched. CONDITION CHECK RESULT CAUSE REMEDY Replace Defective Check continuity 1.Setting time does No continuity. secondary switch. secondary switch.
  • Page 27 (TROUBLE 5) No microwave oscillation even though oven lamp and fan motor run (Display operates properly) CONDITION CHECK RESULT CAUSE REMEDY Defective P.C.B No microwave Disconnect the Replace P.C.B No continuity. oscillation. wire leads from assembly assembly relay 2 and check continuity Continuity.
  • Page 28 (TROUBLE 6) Oven does not cook properly when programmed for the set power level (Operates properly on HIGH) CONDITION CHECK RESULT CAUSE REMEDY Output is full when Defective P.C.B. Replace P.C.B. Disconnect the Abnormal. you set lower assembly. assembly. wire leads from power level.

  • Page 29: Exploded View

    #EV# EXPLODED VIEW INTRODUCTION OVEN CAVITY PARTS INTERIOR PARTS DOOR PARTS BASE PLATE PARTS LATCH BOARD PARTS CONTROL PANEL PARTS...
  • Page 30 #EV# DOOR PARTS 13581A 15006A MC-807WR Model No. MC-807WR / 01 DESCRIPTION 3213W1A028S (DOOR FRAME) * CHANGED THE PART IN THE SECTION OR CIRCUIT - DOOR FRAME & SEAL TAPE (Stock New Parts) 13552A * NSP 13536A 13213A 14890A 13720D...
  • Page 31 #EV# CONTROL PANEL PARTS 24781S 268711 WTP004 249401 23572A 250202 WTP015 23790D 250201 249402 250203...
  • Page 32 #EV# OVEN CAVITY PARTS 54974A 33112U WTT021 WTT021 35264A WTP013 348102 34960R 35300A 34370Z 343501 WMT002 33550H 348101 35301A 36549R WTT010 34810R 33052M 35026C 35026G 33390M WTT011 34370T 33390G 34930R 35889A WTT011 34271A WSZ092 WSZ092 36549S 33650T WTP013...
  • Page 33 #EV# LATCH BOARD PARTS WSZ085 43501A 466001 466003 466001 43500A 44510A...
  • Page 34 #EV# INTERIOR PARTS Button Head (Torx style 2) WSZ185 568772 WSZ062 33808A 56411A 568771 WTT022 56322A WTT010 54975G 55900C 36549C 54620A 54350S 54810S 55900N WNH002 WWP008 WNH003 53504A WWS005 WMT002 56208A 55300S 50FZZA WTT028 56201A 56549F WSZ002 55900A WTT037 54974S WSZ002 34930W WTP004...
  • Page 35 #EV# BASE PLATE PARTS 56170D 63302A 63303A 647781 WSZ062 WSZ002 WTT030 WTT021...

  • Page 36: Replacement Parts List

    REPLACEMENT PARTS LIST For Model :MC-807WR I/C : INTERCHANGEBILITY CODE Rev1. Jan. 14. 2005 Difference Chart (Part No) Location Part Name Alternate MC-807WR I/C MC-807WR / 01 MANUAL,OWNERS 3828W5A2652 → 3828W5A4361 MANUAL,SERVICE 3828W5S4528 COOK BOOK 3878W5A0054 → BOX,YELLOW 3890W3Y454A 3890W3Y904G...
  • Page 37 Difference Chart (Part No) Location Part Name Alternate MC-807WR I/C MC-807WR / 01 466003 SWITCH,MICRO 3B73361E 3B73361D 50CZZH CAPACITOR,DRAWING[HIGH VOLTAGE] 0CZZW1H004S 0CZZW1H002K 50CZZH CAPACITOR,DRAWING[HIGH VOLTAGE] 0CZZW1H004S 0CZZW1H003K 50FZZA FUSE,DRAWING 3B74133N 3B70856K 53504A CHAMBER 3300W1G057A 54350S RING 4B73725A 54810C BRACKET,CAPACITOR 4810W4C003A...

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